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Measurements of the mass and width of the eta(c) meson and of an eta(c)(2S) candidate

Aubert, B; Barate, R; Boutigny, D; Gaillard, JM; Hicheur, A; Karyotakis, Y; Lees, JP; ... BABAR Collaboration, .; + view all (2004) Measurements of the mass and width of the eta(c) meson and of an eta(c)(2S) candidate. PHYS REV LETT , 92 (14) , Article 142002. 10.1103/PhysRevLett.92.142002. Green open access

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Abstract

The mass m(etac) and total width Gamma(tot)(etac) of the eta(c) meson have been measured in two-photon interactions at the SLAC e(+)e(-) asymmetric B Factory with the BABAR detector. With a sample of approximately 2500 reconstructed eta(c) --> (KSK+/-)-K-0 pi(-/+) decays in 88 fb(-1) of data, the results are m(etac) = 2982.5 +/- 1.1 (stat) +/- 0.9(syst) MeV/c(2) and Gamma(tot)(etac) = 34.3 +/- 2.3(stat) +/- 0.9(syst) MeV/c(2). Using the same decay mode, a second resonance with 112 +/- 24 events is observed with a mass of 3630.8 +/- 3.4(stat) +/- 1.0(syst) MeV/c(2) and width of 17.0 +/- 8.3(stat) +/- 2.5(syst) MeV/c(2). This observation is consistent with expectations for the eta(c)(2S) state.

Type: Article
Title: Measurements of the mass and width of the eta(c) meson and of an eta(c)(2S) candidate
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.92.142002
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.92.142002
Language: English
Additional information: The American Physical Society
Keywords: QUANTUM CHROMODYNAMICS, STATE, SPECTROSCOPY, ETA'(C), SEARCH, LEP
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/1303659
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